The best answer that shows the arrow representing shear strength is C : arrow 2
Shear strength is the measure of the strength of a material measured against the structural failure of the material when it fails in shear (i.e. shear stress exceeding the limiting shear strength ). the shear strength of a material is a fixed value, while the shear stress of a material is relative to shear load applied on material per unit area.
Arrows 1 , 3 and 4 do not represent the shear strength because they do not indicate the strength/force of the material against the surface. and they are not fixed forces when compared to arrow 2 which represents the shear strength of the material.
hence the arrow that represents the shear strength on the block of rock is arrow 2
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